Swivel chair



FIG. 1 is a front view showing my new swivel chair;

FIG. 2 is a side view thereof taken from the left of FIG. 1;

FIG. 3 is a side view thereof taken from the right of FIG. 1;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a swivel chair, as shown and described. 